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From "Michael J. Carey (JIRA)" <>
Subject [jira] [Commented] (ASTERIXDB-1556) Prefix-based multi-way Fuzzy-join generates an exception.
Date Wed, 03 Aug 2016 19:28:20 GMT


Michael J. Carey commented on ASTERIXDB-1556:

Just one thing to add/clarify/double-check.  Where one of the points above says
I'm not quite sure what is meant.  We should be sure to account for all the hash table's space
use, in frames.
(Which given how it's built under the covers should not be a hard problem at all.)
I just want to be clear that "HASH TABLE SIZE" should mean its total footprint, not to be
confused with the number of initial entries (array elements) in its directory/table structure.

> Prefix-based multi-way Fuzzy-join generates an exception.
> ---------------------------------------------------------
>                 Key: ASTERIXDB-1556
>                 URL:
>             Project: Apache AsterixDB
>          Issue Type: Bug
>            Reporter: Taewoo Kim
>            Assignee: Taewoo Kim
>         Attachments: 2wayjoin.pdf, 2wayjoin.rtf, 2wayjoinplan.rtf, 3wayjoin.pdf, 3wayjoin.rtf,
> When we enable prefix-based fuzzy-join and apply the multi-way fuzzy-join ( > 2),
the system generates an out-of-memory exception. 
> Since a fuzzy-join is created using 30-40 lines of AQL codes and this AQL is translated
into massive number of operators (more than 200 operators in the plan for a 3-way fuzzy join),
it could generate out-of-memory exception.

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